Hi, I'm building my gaming PC for the first time. I was using newegg's tutorial and came to the part where I had to do a test run. So I did and now when I wanted to pull of the 24 pin cable, it wouldn't budge. All the hardware I bought are new so I don't want to break anything, spent over a grand on it. I pressed on the latch, tried to wiggle it and pull up but nothing would do the job. What should I do?